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Flyback converters are mainly used for low-power applications. A flyback converter is an isolated buck-boost converter, which means that the output voltage can be either higher or lower than the input voltage, depending on the transformer’s turns ratio between the primary and secondary winding. The operation of a flyback converter is very similar to that of a boost converter. When the switch is closed, the primary coil is charged by the input, creating a magnetic field. When the switch is open, the charge in the primary inductor is transferred to the secondary winding, which injects a current into the circuit, powering the load. Flyback converters are relatively easy to design, and require fewer components than other converters, but are not very efficient because there are significant losses due to the hard switching from forcing the transistor to turn on and off arbitrarily (see Figure . Especially in high-power applications, this is very detrimental to the transistor’s lifecycle and generates significant power losses, which is why flyback converters are better suited to low-power applications, usually up to 100W.